A buddy of mine in TX had a Black Simpson Bandit in 2001; he claimed it was a very noisy helmet and didn't have it long. This was compared to a Shoei RF900. Hopefully, they've improved by now..
I guess I don't see why the police would use it as a mark against you, I dunno maybe it's different in the UK. Maybe the cop was just using any excuse to haze you.
Heck, I had a Shoei RF900 Orbit graphic, seemed like it should have gotten more attentio than a plain white helmet; and it didn't attract attention.
They do have some wild ones out that could make you look like a holigan: